This page was last updated at the end of April 2006. Prices for energy, interest rates and the requirements for incentives may change very quickly. However, such changes only have a small influence on the core statement ("​yellow table"​) Why?

This page was last updated at the end of April 2006. Prices for energy, interest rates and the requirements for incentives may change very quickly. However, such changes only have a small influence on the core statement ("​yellow table"​) Why?

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* The economic viability of building measures that are taken is determined not so much by the current market as it is by the average economical constraints for the duration of usage of a building, (which is more than 30 years).

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* The economic viability of building measures that are taken is determined not so much by the current market as it is by the average economical constraints for the duration of usage of a building (which is more than 30 years).

* "Much can happen"​ during this period. But: Today it is possible for the building constructor to have the interest rate conditions fixed at a comparatively low level for the next twenty or thirty years. It is rather unlikely that energy will become cheaper on average in the next few decades than it is now. The most important parameters are relatively certain, even if current fluctuations occur from time to time which give a different impression.

* "Much can happen"​ during this period. But: Today it is possible for the building constructor to have the interest rate conditions fixed at a comparatively low level for the next twenty or thirty years. It is rather unlikely that energy will become cheaper on average in the next few decades than it is now. The most important parameters are relatively certain, even if current fluctuations occur from time to time which give a different impression.